HomeMy WebLinkAboutConsultant Review - 5 VILLAGE WAY 12/5/2007 VHB Proj„No.. 09280038
Application for Watershed Special Permit—5 Valley Way—North Andover,MA
APPENDIX A
Scope of Services
The scope of services consists of the engineering review of the site plan and special permit.. the major tasks
are listed below:
I. Plan Review: Review the Watershed Special Permit plans for conformance to the current Zoning Bylaw
and standard engineering practice.. Prepare one (1) engineering review report listing written comments..
Provide one(1) `follow-up'letter that addresses the Applicant's responses to the engineering report.
2.. Project Management: Provide a preliminary review of the plan submission for the purpose of
establishing a detailed budget with upset limits £or engineering services for the scope of services
contained herein,Plan,monitor and coordinate the review efforts
Services Not Included
The following additional services are not provided in this scope of work:
1.. Review of architectural plans.
2.. Pollutant load calculations review..
3- Structural review,design or analysis.
4. Review of'mechanical design
5 Construction inspection.
6 Attendance at meetings.
Should services be required in these areas,or areas not previously described,the ENGINEER will prepare a
proposal or amendment,that contains the Scope of Services, Compensation, and Schedule to complete the
additional services.
7wo originals of this Author nation need to be executed One original:reeds to be forwarded to Accounting Contract Files
T.109280 001docstcontracAO9280-C7 ntAutht38-ClntAuth-SValleyWay-WSP doc
TOWN OF NORTH ANDOVER PLANNING BOARD
ENGINEERING REVIEW OF SITE PLAN AND WATERSHED SPECIAL PERMIT
FOR CONFORMANCE WITH THE
TOWN OF NORTH ANDOVER ZONING BYLAW
Site Plan Title: Watershed Special Permit Plan VHB No.: 09280.38
Site Plan Location: 5 Village Way,North Andover,MA
Applicant: Danielle and David Dellovo,5 Village Way,North Andover,MA
Applicant's Engineer: New England Engineering Services,Inc., 1600 Osgood Street,North Andover,MA
Plan Date: July 2,2007 Review Date: 10-31-07
The plan was reviewed for conformance to the 1972 Town of North Andover Zoning Bylaw(last amended
July 10,2006). The Applicant has submitted the following information for VHB's review:
• Application for Watershed Special Permit,
• Watershed Special Permit Plan,5 Village Way—1 Sheet,dated July 2,2007.
The following comments note non-conformance with specific sections of the Zoning Bylaw or
questions/comments on the proposed design and VHB's recommendations/suggestions.
Town of North Andover Zoning Bylaw
1. (4.121.7) The Applicant should specify on the plans that the proposed fence is at least 4 feet high,as
required by this section.
2. (4.136.3.b.iii.2 and 3)VHB suggests adding notes on the plans prohibiting the use of lawn care
products that may contribute to the degradation of the public water supply or the use of garden products
that are not organic or slow-release nitrogen,as required by this section.
3. (4.136.4.c.ii.1)VHB suggests adding a note specifying that the annual mean high water mark of Lake
Cochichewick is over 400 feet from the site.
4. (4.136.4.c.ii.6) The Applicant should show the limits of vegetation clearing/limit of work around the
fence on the west side of the house and around the driveway and infiltration system area.
5. (4.136.4.c.iii) A written certification from a registered professional engineer,or other scientist
educated in and possessing extensive experience in the science of hydrology and hydrogeology,has not
been provided with this submission,as required by this section.
General Site Plan/Drainage Comments
6. VHB suggests adding a north arrow to the plan.
7. The Applicant should provide sizing calculations for the proposed infiltration system,it is unclear how
the size of the system(as shown on the plan)was determined.
8. Have test pits been taken at the location of the proposed infiltration system? The Applicant should
verify that there is a 2-foot separation between annual high groundwater and the bottom of the
infiltration system.
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9. The Deep Sump Catch Basin detail specifies a frame and cover,a frame and grate should be specified.
10. The Applicant should specify the material thicknesses of the driveway pavement and gravel on the
Bituminous Curb—Type"A"(BC)detail.
11. The Stone Retaining Wall detail specifies 2-inch PVC pipes every 15 feet,on center,however it
appears the proposed walls on the west side of the house are only 10 feet long.
12. The Applicant should clarify the use of the proposed retaining walls on the west side of the house. It
does not appear that any grade changes are required at this location.
13. The Applicant should specify the inverts,materials and length of the pipe connecting the proposed
catch basin and the proposed infiltration system.
14. Is the infiltration system designed to completely capture/infiltrate the first inch of runoff from the new
impervious areas,or to detain it to mitigate peak runoff rates?
15. Is an outlet/overflow pipe proposed for the infiltration system,or is it the intent to allow runoff to
backup through the catch basin and flow overland to the adjacent wetland?
16. The plan graphically shows the infiltration system to have 24 units(4 x 6),however the Storm Tech
SC-310 Infiltrator detail specifies"10 units wide x 2 units deep". The Applicant should revise for
consistency.
17. In the Storm Tech SC-310 Infiltrator detail,it appears the elevation for the bottom of the crushed stone
is incorrect(97.67 should read 94.67). The Applicant should revise.
18. In the Storm Tech SC-310 Infiltrator detail,VHB suggests that the"12"Earth Cover"note be revised
to read"12"Min Earth Cover",since it appears the infiltration system will be almost 10 feet below
ground.
19. The Erosion Control detail should specify the direction of flow of runoff.
It is recommended that the Applicant provide WRITTEN RESPONSES to the issues and comments
contained herein.
Reviewed by: Date:
Darryl Gallant,P.E.
Civil Engineer—Highway and Municipal
Checked by: Date:
Timothy B.McIntosh,P.E.
Project Manager—Highway and Municipal
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NEw ENGLANDENGiNEr,,FjNG SERvia:s, INc.
1600 Osgood Street
Building 20 Suite 2-64
North Andover, MA 01845
Tkl,l: (978) 686-1768 ® Fax: (978) 327-6138
www.neengineeringinc.com November 15, 2007
Lincoln Daley
North Andover Planning Board
400 Osgood Street
North Andover, MA 01845
Re: 5 Village Way,North Andover
Watershed Special Permit
Dear Lincoln:
This letter is being written to address the items of deficiency outlined in your letter dated
October 25, 2007 and a letter from VHB dated October 31,2007. Responses to the
comments are listed below.
Comments from Lincoln Daley
0 4.136 (4)(c)(vii).A certification regarding the downgradiant concentrations of
phosphorus and nitrogen and other relevant chemicals is enclosed.
0 The project uses a combination of pervious pavement and infiltration of roof
runoff to keep post development runoff values the same as pre development
values. Calculations demonstrating that flow volumes remain the same in a 100
year storm pre and post development are enclosed.
0 Roof runoff is being channeled to the infiltrator using gutters, downspouts and
PVC pipes. Driveway runoff is being infiltrated using pervious pavement. If the
pervious pavement stops infiltrating in a large storm the runoff will be channeled
through a deep sump catch basin and then to the infiltrator system.
0 This home site and the adjacent home sites are wooded with areas of yard. The
proposed garage and pool are not in close proximity to other dwellings and meet
the required zoning offsets and therefore will not have an adverse impact on
adjacent properties.
0 The extent of clearing has been added to the plans.
0 The wetland delineation has been extended to the property limit as well as the
Non Disturb Zone lines and the Non Discharge Zone lines.
0 The plans have been revised to depict the amount of impervious area associated
with each new structure.
0 The proposed fence has been specified as being 4 feet in height to comply with
the building code. The exact type of fence has not been decided upon by the
owner at this time.
0 The plans have been revised to show a north arrow and the locus at a scale of I"
1500 feet.
Comments from VHB
The fence has been specified as being 4 feet high
A note prohibiting the use of lawn care products that will degrade the quality of
water entering the water supply have been added to the plans.
A note stating that the water supply is greater than 400 feet from the project has
been added to the plans.
The limits of clearing have been shown.
A letter regarding the water quality has been included with this revised submittal
package.
The North Arrow has been added to the plans.
Calculations regarding the size of the infiltrator system are enclosed.
A test pit has been taken in the area of the infiltrator. The information has been
added to the plans.
The deep sump catch basin now specifies a frame and grate.
The driveway detail has been revised.
The stone retaining wall detail specified a weep hole every 15 feet. This wall
detail is to be used at the rear of the pool deck as well as adjacent to the house.
The walls against the house will not need the weep holes.
The proposed retaining walls on the left side of the house are to access a new
basement door. There is no proposed grade change in this area except the removal
of the fill between the walls to create the new access.
The details of the pipe between the catch basin and the infiltrator area have been
added to the plans.
The infiltrator area is used to infiltrate and mitigate peak runoff. The design keeps
post development volumes the same as pre development volumes for the
disturbed areas.
An overflow has been added to the infiltrator.
The note in the infiltrator detail has been revised.
The elevations of the infiltrator system have been revised.
The infiltrator elevations have been revised to indicate the proper depth of 12"
below the ground. The 12"earth cover has been revised to indicate that the 12" is
a minimum.
The direction of flow has been added to the erosion control detail.
If you need further information or clarification,please don't hesitate to contact this
office.
Sincerely,
Ben'min C., OsgKod, Jr. PE.
President
NEW ENGLAND ENGINEERING SERVICES
1600 OSGOOD ST, BLDG.20, SUITE 2-64 INC JOB 131-1-3
NORTH ANDOVER, MA 01845 —
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5 village way Type /// 24-hr 100 yr Rainfall=6.40"
Prepared by NEW ENGLAND ENGINEERING SERVICES INC. Printed 11/27/2007
HydroCAD®8.50 s/n 002248 @2007 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1S: driveway pre dev
Runoff = 0.23 cfs @ 12.01 hrs, Volume= 622 cf, Depth> 3.03"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type III 24-hr 100 yr Rainfall=6.40"
Area (sf) CN Description
2,466 69 50-75% Grass cover, Fair, HSG B
2,466 Pervious Area
Summary for Subcatchment 2S: driveway post dev
Runoff = 0.41 cfs @ 12.00 hrs, Volume= 1,266 cf, Depth> 6.16"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type III 24-hr 100 yr Rainfall=6.40"
Area (sf) CN Description
2,466 98 Paved parking & roofs
2,466 Impervious Area
Summary for Subcatchment 3S: addition area pre dev
Runoff = 0.27 cfs @ 12.01 hrs, Volume= 725 cf, Depth> 3.03"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type III 24-hr 100 yr Rainfall=6.40"
Area (sf) CN Description
2,873 69 50-75% Grass cover, Fair, HSG B
2,873 Pervious Area
Summary for Subcatchment 4S: addition/pool post dev
Runoff = 0.47 cfs @ 12.00 hrs, Volume= 1,475 cf, Depth> 6.16"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
Type III 24-hr 100 yr Rainfall=6.40"
Area (sf) CN Description
2,873 98 Paved parking & roofs
2,873 Impervious Area
SOIL SURVEY
190
TABLE 16.--SOIL AND WATER FEATURES
[The definitions of "flooding" and "water table" in the Glossary explain terms such as "rare," "brief,"
"apparent," and "perched." The symbol < means less than; > means more than. Absence of an entry
indicates that the feature is not a concern]
Flooding High water table Risk of corrosion
Soil name and ;Hydro-;- — — iPotentiali-
map symbol I logic! Frequency ; Duration !Months 1 Depth ; Kind !Months 1 frost !Uncoated !Concrete
!group !
! i 1 action 1 steel !
---
--- 'Low------!Low------ 11Hi h.
AgA, AgB, AgC-----! B ;None--------i --- { --- i >6.0 i { i ' i g
Agawam
__
_ ! --- 11 0-2.5!!ApparentIDee-AprIModerate ;Moderate (Moderate.
-
AmA, AmB--------- i C !None--------
i;
!
Amostown ! ! ! !
!
Ba*.
Beaches
BeA, BeB, BeC-----! B ;None--------! --- ! --- 11.5-3.51ApparentlNov-AprlHigh-----!Moderate ;Moderate.
Belgrade ! ! !
!
gr________ --1 D (None--------! --- ! --- ! 0-1.0lApparentl Oct-JuilHigh-----!High-----!High.
------
Birdsall
Bu A, BuB, BuC-----!1 C (None--------'! --- ! --- 11.0-3.0l1Perched !Nov-MayiHigh-----(High-----!Moderate.
i Buxton I ! ! !
i
BxB*, BxC*: -!High-----!Moderate.
Buxton-----------1 C !None-------- 1.0-3.0lPerched 1 ov- ayg
!
Rock outcrop.
CaA, CaB, CaC,
!
CaD, CbB, CbC,
CbD, CCB, CCC, ! ! 1 -_ >6.0 1 --- ! --- !Low------!Low------;High.
CeD--------------! B ;None--------!
Canton ! I
`L CDE*: ! i i i !
JJ� --- !Low------!Low------!High.
Canton---------- B !None-------- --- i --- i >6.0 ! --- !
---
Charlton---------! B !None--------! --- ! --- ! >6.0 ! ! --- !Low
>6.0 1 --- ! --- !Low------!Low------!High.
CeA, CeB----------! A !None--------! --- - 1 I
Carver ! ! ! !
CmB, CmC CmD ! ! ! i !
COB, CoC, COD----! B !None--------! --- -
__ >6.0 --- !Low------!Low------!High.
Charlton ! ! !
CrB*, CrC*, CrD*: ! ! !
Charlton---------! B !None--------
! --- ! --- ! >6 0 ! --- ! --- !Low------!Low------!High.
Rock outcrop. ! ! ! ! ! !
!
--- 'Moderate !Low------!High.
Hollis-----------! C/D !None--------! --- ! --- ! >6.0 ! --- ! !
1 1 ! ! 1 ! ! !
-- '1 0-3.0!A arent!Dec-A r!Moderate !Low------!High.
De----------------! B !None--------! --- - pp p
Deerfield ! ! ! ! !
!
Du*.
Dumps ! !
ElA, E1B----------! C !None--------1 --- ! --- 11.0-3.OIPerched !!Nov-MayiHigh-----!Moderate !Moderate.
Elmwood ! !
'Moderate.
Ha----------------! B !Occasional !Brief-----!Oct-Aprl3.0-6.0l Apparent,Nov-MayiHigh-----,Low- ---
Hadley ! !
HfA, HfB, HfC, __
HfD--------------! A !None--------'! --- ! --- ! >6.0 !! --- I! - !Low------I!Low------!High.
Hinckley ! ! 1
See footnote at end of table.
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TO Incremental
Table 6 and Table 7 provide incremental storage volumes TABLE 7-SC-740 Incremental Storage Volumes Per Chamber
for SC-740 and SC-310 chamber systems. This Assumes 40% Volume of Voids in the Stone.
information may be used to calculate a detention/re- Calculations are Based Upon a 6-inch Stone Base
tention system's stage storage volume. Under the Chambers.
Product Specifications: 1.1, 2.2, 2.3, 2.4 and 2.6
TABLE 6-SC-310 Incremental Storage Volumes Per Chamber
_�r- 0, 74.90
Assumes 40% Volume of Voids in the Stone. 4
Calculations are Based Upon a 6-inch Stone Base 41 0 73.77
Under the Chambers. 40 Stone 0 72.64
4� 39 Cover 0 71.52
ZINO 38 0 70.39
' - L 37 _0 69.26
36 45.90 68.14
35 45.85 66.98
28 _ 0 31.00 34 45.69 65.75
27 0 30,.21 33 45.41 64.46
26 Stone 0 29.42 32 44.81 62.97.
25 Cover 0 28.63 31 44.01 61.36
24 0 27.84 30 43.06 59.66
23 0 27.05 29 41.98 57.89
22 14.70 26.26 28 40.80 56.05
21 14.64 25.43
27 39.54 54.17 1.
20 14.49 24.54 26 38.18 52.23
19 14.22 23.58 25 36.74 50.23
18 13.68 22.47 24 35.22 48.19 23 33.64 46.11
17 12.99 21.25 22 31.99 44.00
16 12.17 19.97 21 30.29 41.85
15 11.25 18.62 20 28.54 39.67
14 10.23 17.22 19 26.74 37.47
13 9.15 15.78 18 24.89 35.23
12 7.99 14.29 17 23.00 32.96
11 6.78 12.77 16 21.06 30.68
10 5.51 11.22 15 19.09 28.36
9 4.19 9.64 14 17.08 26.03
8 2.83 8.03 13 15.04 23.68
7 1.43 6.40 12 12.97 21.31
6 0 4.74 11 10.87 18.92
10 8.74 16.51
5 0 3.95 g 6.58 14.09
4 Stone 0 3.16 8 4.41 11.66
3 Foundation 0 2.37 7 2.21 9.21
2 0 1.58 6 0 ---_-- 6.76
1 0 0.79 5 0 5.63
��-- 4 Stone 0 4.51
3 Foundation 0 3.38
2 0 2.25
1 0 1.13
12 Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information.
STATEMENT OF WATER QUALITY IMPACT
5 VILLAGE WAY,NORTH ANDOVER,MA
Potential degradation of water quality associated with residential development can be
most closely associated with the following:
• Ground water contamination from on site subsurface sewage disposal systems.
• Construction activity resulting in erosion of soil into adjacent wetlands.
• Increases in storm water volume runoff from impervious surfaces.
• Chemical loading as a result of fertilizer and pesticide application.
None of the above activities at the above referenced location will adversely impact the
water quality in the adjacent wetlands and downstream waters, i.e. Lake Cochichewick
due to the following:
• The site is serviced by municipal sewer.
• Erosion control consisting of double staked haybales backed by siltation fence
will be installed between the project site and the downstream wetland areas to
prevent siltation during construction.
• Increases in storm water volume will be absorbed by infiltration of roof water
runoff in to the ground. Surface water peak runoff volumes will be reduced.
Driveway runoff will be infiltrated using pervious pavement and a crushed stone
base. Overflows from the driveway will filtered through a deep sump catch basin.
• Use of organic and low nitrogen fertilizers and curtailing the use of pesticides will
reduce the potential chemical loading in to adjacent wetlands.
Application of the above measures will result in no increase in concentrations of nitrogen,
phosphorous and other dissolved inorganic chemicals. The quality of surface and ground
water adjacent to Lake Cochichewick will not be adversely impacted by the proposed
constru s h, -74-,V4arbleridge Road,North Andover.
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